SwiftNIO 1.0.0-1.3.9 - Denial of Service via HTTP/2 Window Size Manipulation
Title source: llmExploitation Summary
EIP tracks 2 public exploits for CVE-2019-9511. PoCs published by harley-ghostie, flyniu666.
AI-analyzed exploit summary The repository contains lightweight probes for detecting HTTP/2 vulnerabilities CVE-2019-9511 (Data Dribble) and CVE-2019-9513 (Priority Churn) without executing a full denial-of-service attack. The scripts validate server behavior by sending controlled HTTP/2 frames to observe potential vulnerabilities.
Description
Some HTTP/2 implementations are vulnerable to window size manipulation and stream prioritization manipulation, potentially leading to a denial of service. The attacker requests a large amount of data from a specified resource over multiple streams. They manipulate window size and stream priority to force the server to queue the data in 1-byte chunks. Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both.
Exploits (2)
nomisec
SCANNER
by harley-ghostie · poc
https://github.com/harley-ghostie/CVE-2019-9511_Priority-Churn-Data-Dribble
The repository contains lightweight probes for detecting HTTP/2 vulnerabilities CVE-2019-9511 (Data Dribble) and CVE-2019-9513 (Priority Churn) without executing a full denial-of-service attack. The scripts validate server behavior by sending controlled HTTP/2 frames to observe potential vulnerabilities.
Classification
Scanner 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target:
HTTP/2 implementations (e.g., nginx, Apache, Envoy, HAProxy, Tomcat, Jetty, Node.js, Go net/http2, nghttp2)
No auth needed
Prerequisites:
Server must support HTTP/2 via ALPN · TLS connection to the target host
MITRE ATT&CK
devstral-2 · analyzed Apr 30, 2026
Full analysis →
nomisec
WORKING POC
by flyniu666 · poc
https://github.com/flyniu666/ingress-nginx-0.21-1.19.5
This repository contains build scripts and CI/CD configurations for Kubernetes Ingress-NGINX, specifically targeting CVE-2019-9511. The scripts automate the build and deployment process, including Docker image creation and publishing to Quay.io.
Classification
Working Poc 90%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target:
Kubernetes Ingress-NGINX (versions 0.21-1.19.5)
No auth needed
Prerequisites:
Access to a Kubernetes cluster with Ingress-NGINX deployed · Ability to send crafted HTTP/2 requests
MITRE ATT&CK
devstral-2 · analyzed Feb 16, 2026
Full analysis →
References (47)
Core 47
Core References
Third Party Advisory, US Government Resource third-party-advisory
x_refsource_cert-vn
https://kb.cert.org/vuls/id/605641/
Third Party Advisory vendor-advisory
x_refsource_ubuntu
https://usn.ubuntu.com/4099-1/
Mailing List, Third Party Advisory vendor-advisory
x_refsource_fedora
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TAZZEVTCN2B4WT6AIBJ7XGYJMBTORJU5/
Mailing List, Third Party Advisory mailing-list
x_refsource_bugtraq
https://seclists.org/bugtraq/2019/Aug/40
Mailing List, Third Party Advisory vendor-advisory
x_refsource_fedora
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LZLUYPYY3RX4ZJDWZRJIKSULYRJ4PXW7/
Third Party Advisory vendor-advisory
x_refsource_debian
https://www.debian.org/security/2019/dsa-4505
Mailing List, Third Party Advisory vendor-advisory
x_refsource_fedora
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JUBYAF6ED3O4XCHQ5C2HYENJLXYXZC4M/
Mailing List, Third Party Advisory vendor-advisory
x_refsource_fedora
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BP556LEG3WENHZI5TAQ6ZEBFTJB4E2IS/
Mailing List, Third Party Advisory vendor-advisory
x_refsource_fedora
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XHTKU7YQ5EEP2XNSAV4M4VJ7QCBOJMOD/
Mailing List, Third Party Advisory mailing-list
x_refsource_bugtraq
https://seclists.org/bugtraq/2019/Sep/1
Third Party Advisory vendor-advisory
x_refsource_debian
https://www.debian.org/security/2019/dsa-4511
Mailing List, Third Party Advisory vendor-advisory
x_refsource_fedora
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/POPAEC4FWL4UU4LDEGPY5NPALU24FFQD/
Third Party Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2019:2692
Mailing List, Third Party Advisory vendor-advisory
x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00035.html
Mailing List, Third Party Advisory vendor-advisory
x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00032.html
Mailing List, Third Party Advisory vendor-advisory
x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00031.html
Third Party Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2019:2745
Third Party Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2019:2746
Third Party Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2019:2775
Third Party Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2019:2799
Third Party Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2019:2925
Third Party Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2019:2939
Third Party Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2019:2949
Mailing List, Third Party Advisory vendor-advisory
x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00003.html
Mailing List, Third Party Advisory vendor-advisory
x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00005.html
Third Party Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2019:2955
Third Party Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2019:2966
Mailing List, Third Party Advisory vendor-advisory
x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00014.html
Third Party Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2019:3041
Third Party Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2019:3933
Third Party Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2019:3935
Third Party Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2019:3932
Third Party Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2019:4018
Third Party Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2019:4019
Third Party Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2019:4021
Third Party Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2019:4020
Third Party Advisory vendor-advisory
x_refsource_debian
https://www.debian.org/security/2020/dsa-4669
Patch, Third Party Advisory x_refsource_misc
https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
Third Party Advisory x_refsource_misc
https://www.oracle.com/security-alerts/cpuoct2020.html
Third Party Advisory x_refsource_misc
https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-002.md
Third Party Advisory x_refsource_confirm
https://www.synology.com/security/advisory/Synology_SA_19_33
Third Party Advisory x_refsource_confirm
https://support.f5.com/csp/article/K02591030
Third Party Advisory x_refsource_confirm
https://security.netapp.com/advisory/ntap-20190823-0002/
Third Party Advisory x_refsource_confirm
https://security.netapp.com/advisory/ntap-20190823-0005/
Third Party Advisory x_refsource_confirm
https://kc.mcafee.com/corporate/index?page=content&id=SB10296
Vendor Advisory x_refsource_confirm
https://support.f5.com/csp/article/K02591030?utm_source=f5support&%3Butm_medium=RSS
Third Party Advisory x_refsource_misc
https://www.oracle.com/security-alerts/cpujan2021.html
Scores
CVSS v3
7.5
EPSS
0.5955
EPSS Percentile
99.0%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lab Environment
Details
CWE
CWE-400
CWE-770
Status
published
Products (28)
apache/traffic_server
6.0.0 - 6.2.3
apple/swiftnio
1.0.0 - 1.4.0
canonical/ubuntu_linux
16.04
canonical/ubuntu_linux
18.04
canonical/ubuntu_linux
19.04
debian/debian_linux
9.0
debian/debian_linux
10.0
f5/nginx
1.9.5 - 1.16.1
fedoraproject/fedora
29
fedoraproject/fedora
30
... and 18 more
Published
Aug 13, 2019
Tracked Since
Feb 18, 2026